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Preparation of lithium iron phosphate precursor and charging battery electrode thereof

A precursor and electrode technology, applied in the field of rechargeable batteries, can solve the problems of reduced active material occupancy, unsatisfactory battery performance, slowed down reaction speed, etc. Effect

Inactive Publication Date: 2009-07-08
郑州市联合能源电子有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with this technology is that the binder that has to be contained in the slurry reduces the occupancy of the active material, directly reduces the battery capacity, increases the internal resistance of the battery, slows down the reaction speed and the speed of absorbing the electrolyte
The slurry of this method contains a binder, which directly reduces the battery capacity and has a large internal resistance. The performance of the resulting battery is not ideal, and the manufacturing process is also relatively complicated.

Method used

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  • Preparation of lithium iron phosphate precursor and charging battery electrode thereof
  • Preparation of lithium iron phosphate precursor and charging battery electrode thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment one: see figure 1 , figure 2 , a preparation method of a rechargeable battery electrode, by first preparing a precursor, and then using the precursor to directly prepare an electrode, the specific steps are as follows:

[0029] 1. Precursor preparation:

[0030] (1) LiOH·H 2 O, Fe(NO 3 ) 3 9H 2 O, H 3 PO 4 , Ascorbic acid is weighed in a molar ratio of 1:1.2:1:0.6, LiOH·H 2 O is dissolved in deionized water to obtain a solution, the solution concentration is 8.0mol / L, add ascorbic acid, add Fe(NO 3 ) 3 9H 2 O, add H at the end 3 PO 4 solution, fully stirred and mixed evenly, aged for 2 hours;

[0031] (2) Dry for 10 hours at a temperature of 70°C and a vacuum of less than 10 Pa;

[0032] (3) The dried product was ground in a ball mill for 30 min, then placed in an alumina crucible, and heat-treated at 210° C. for 2 hours under the protection of argon to obtain a precursor.

[0033] 2. Electrode preparation method:

[0034] (1) Mix the prepare...

Embodiment 2

[0039] Embodiment two: see figure 1 , figure 2 .

[0040] 1. Precursor preparation:

[0041] (1) Li(CH 3 CO 2 )·2H 2 O, Fe(NO 3 ) 3 9H 2 O. Li 3 PO 4 、HOCH 2 COOH is weighed in a molar ratio of 1:1.2:0.8:1.2, Li(CH 3 CO 2 )·2H 2 O was dissolved in deionized water to obtain a 5.0mol / L solution, and then HOCH was added 2 COOH, add Fe(NO 3 ) 3 9H 2 O, add Li at the end 3 PO 4 solution, fully stirred and mixed evenly, and aged for 4 hours;

[0042] (2) Dry for 11 hours at a temperature of 80°C and a vacuum of 9 Pa;

[0043] (3) Add 6% sucrose of the product weight to the dried product, grind it in a ball mill for 40 minutes, then place it in a graphite crucible, and heat-treat it at 300° C. for 2 hours under the protection of nitrogen to obtain a precursor.

[0044] 2. Electrode preparation:

[0045] (1) Mix the precursor and the graphite conductive agent evenly in a weight ratio of 1:0.08, and put them into the powder box 2;

[0046] (2) Put the perforated a...

Embodiment 3

[0050] Embodiment three: see figure 1 , figure 2 .

[0051] 1. Precursor preparation:

[0052] (1) Li(CH 3 CO 2 )·2H 2 O, Fe(NO 3 ) 3 9H 2 O. Li 3 PO 4 、C 2 h 2 o 4 Weigh it according to the molar ratio of 1:1.2:1.1:0.5, Li(CH 3 CO 2 )·2H 2 O was dissolved in deionized water to obtain a solution with a concentration of 4.0mol / L, and then C was added 2 h 2 o 4 , add Fe(NO 3 ) 3 9H 2 O, add Li at the end 3 PO 4 solution, fully stirred and mixed evenly, aged for 2 hours;

[0053] (2) Dry for 6 hours at a temperature of 90°C and a vacuum of 5 Pa;

[0054] (3) Add 8% glucose by weight to the dried product, grind it in a ball mill for 30 min, then place it in a graphite crucible, and heat-treat it at 300° C. for 2 hours under the protection of nitrogen to obtain a precursor.

[0055] 2. Electrode preparation:

[0056] (1) Mix the precursor and the carbon black conductive agent evenly in a weight ratio of 1:0.1, and put them into the powder box 2;

[0057]...

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Abstract

The invention discloses a lithium iron phosphate precursor and a method for preparing a rechargeable battery electrode thereof. The method comprises the following steps: using a prepared active substance LiFePO4 precursor as a basic raw material, attaching the active substance to a conductive skeleton firmly by using intermolecular forces of the active substance precursor, and then pressing and sintering the active substance precursor to obtain the electrode. The method does not need adhesive to attach the active substance to the skeleton so as to simplify production technology; the electrode prepared by the method has the advantages of little internal resistance, high reaction speed and quick electrolyte absorption; and the method has the advantages of simple process, low energy consumption, low cost and better electric conductivity of the electrode. After the electrode prepared by the method is assembled into an actual battery with a cathode which is prepared by graphite, the internal resistance of the battery is less than or equal to 20 milliohms, the primary discharge capacity can reach 582 milliamperes, and the specific capacity can reach 102.1 milliamperes; and the discharge capacity still can reach 560 milliamperes after 50 times of cycle.

Description

1. Technical field: [0001] The invention relates to a rechargeable battery, in particular to a lithium iron phosphate precursor and a preparation method for a rechargeable battery electrode. 2. Background technology: [0002] Rechargeable batteries have achieved tremendous development in recent years, especially because the development of electronic appliances such as mobile phones has provided broad prospects for the development of batteries, and at the same time put forward higher and higher requirements for their performance, requiring batteries to be larger than energy , long life, low cost, and good consistency of battery performance. [0003] To improve the performance of rechargeable batteries, the electrode preparation method is a very critical step. Lithium-ion batteries are widely used in rechargeable batteries. At present, the traditional electrode structure and preparation method is to use aluminum foil for the skeleton, add active materials and binders to make ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C01B25/45H01M4/58
CPCY02E60/12Y02E60/10
Inventor 刘新保贾晓林周永刚蔡俊明李恩惠
Owner 郑州市联合能源电子有限公司
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